Power Source Conversion Module, Power Supply Apparatus and Power Supply Method

ABSTRACT

A power supply apparatus including: N+m power source conversion modules, where N power source conversion modules are main power source conversion modules; a power source conversion module includes a detection and switching unit and a conversion unit, where the detection and switching unit is separately connected to an output end of a first alternating current power source and an output end of a second alternating current power source, and the detection and switching unit is configured to monitor in real time a working state of the first alternating current power source and a working state of the second alternating current power source, close a channel between the conversion unit and one power source, which is in a normal working state, of the first alternating current power source and the second alternating current power source.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of International Application No.PCT/CN2014/070869, filed on Jan. 20, 2014, which claims priority toChinese Patent Application No. 201310331761.0, filed on Aug. 1, 2013,both of which are hereby incorporated by reference in their entireties.

TECHNICAL FIELD

Embodiments of the present invention relate to electronic technologies,and in particular, to a power source conversion module, a power supplyapparatus and a power supply method.

BACKGROUND

A typical communications device and a typical information communicationstechnology (ICT) device include a power supply apparatus, a serviceboard, a cooling fan, and the like. The power supply apparatus isresponsible for receiving one or more power source inputs outside adevice, and converting the power source, which is input from outside thedevice, into a power source available to a load (including the serviceboard, the cooling fan, and the like) in the device.

As shown in FIG. 1, when N (number of) power sources are input to thepower supply apparatus, N power source conversion modules need to bedisposed in the power supply apparatus. Each power source conversionmodule is connected to one power source, that is, the N power sourcesneed N power source conversion modules, and the power source conversionmodule converts an output voltage of the power source into a directcurrent voltage required by a load in a device, which generally is −48volts (V) or 12 V. To meet high reliability, N+N standby is generallyperformed on power sources, that is, each power source has a standbypower source. Each power source conversion module receives power fromone power source. Correspondingly, N+N standby is also performed on thepower source conversion modules, where N power source conversion modulesreceive power from N line-A power sources, and other N power sourceconversion modules receive power from N line-B power sources.

Therefore, when N+N standby is performed on N power sources, N+N standbyalso needs to be performed on the power source conversion modules. Thepower supply apparatus needs a large number of power source conversionmodules; especially, for a high-power device, the power supply apparatusneeds more power source conversion modules. For example, for a devicewith power consumption over 20 kilowatts (kW), the number of powersource conversion modules may exceed 16. Therefore, the power supplyapparatus needs a large number of power source conversion modules, whichincreases power supply costs of a system, and also increases spaceoccupied by the power source conversion modules.

SUMMARY

Embodiments of the present invention provide a power source conversionmodule, a power supply apparatus and a power supply method, which areused to solve the defect of the large number of power source conversionmodules in a power supply apparatus, thereby decreasing the number ofpower source conversion modules in the power supply apparatus whilemeeting high reliability of the power supply.

According to a first aspect, an embodiment of the present inventionprovides a power source conversion module, including: a detection andswitching unit and a conversion unit, where the detection and switchingunit is separately connected to an output end of a first alternatingcurrent power source and an output end of a second alternating currentpower source, the detection and switching unit is further connected tothe conversion unit, and the conversion unit is connected to a load,where the detection and switching unit is configured to monitor in realtime a working state of the first alternating current power source and aworking state of the second alternating current power source, close achannel between the conversion unit and one power source, which is in anormal working state, of the first alternating current power source andthe second alternating current power source, and shut off a channelbetween the conversion unit and the other power source of the firstalternating current power source and the second alternating currentpower source; and the conversion unit is configured to rectify analternating current voltage output by the one alternating current powersource, which is in the normal working state, in the channel closed bythe detection and switching unit, and convert the alternating currentvoltage into a direct current voltage required by the load.

With reference to the first aspect, in a first possible implementationmanner, the detection and switching unit includes: a detection subunit,a control subunit, a first switching subunit and a second switchingsubunit, where the detection subunit is separately connected to theoutput end of the first alternating current power source and the outputend of the second alternating current power source; the detectionsubunit is further connected to the control subunit; and the detectionsubunit is configured to detect in real time a voltage value of thefirst alternating current power source and a voltage value of the secondalternating current power source, and send the detected voltage value ofthe first alternating current power source and the detected voltagevalue of the second alternating current power source to the controlsubunit; the control subunit is separately connected to the detectionsubunit, the first switching subunit and the second switching subunit;and the control subunit is configured to monitor in real time, accordingto the voltage value of the first alternating current power source,whether the first alternating current power source is in a normalworking state, and monitor in real time, according to the voltage valueof the second alternating current power source, whether the secondalternating current power source is in a normal working state; the firstswitching subunit is separately connected to the first alternatingcurrent power source, the conversion unit and the control subunit; andthe second switching subunit is separately connected to the secondalternating current power source, the conversion unit and the controlsubunit; the control subunit is further configured to, according to aworking state of the first alternating current power source and aworking state of the second alternating current power source, send aclosing signal to the first switching subunit or the second switchingsubunit connected to one alternating current power source, which is in anormal working state, of the first alternating current power source andthe second alternating current power source, and send a shutoff signalto the first switching subunit or the second switching subunit connectedto the other power source, so as to close the channel between theconversion unit and the one alternating current power source, which isin the normal working state, of the first alternating current powersource and the second alternating current power source, and shut off thechannel between the conversion unit and the other alternating currentpower source of the first alternating current power source and thesecond alternating current power source; the first switching subunit isconfigured to shut off or close the channel between the firstalternating current power source and the conversion unit according to acontrol signal sent by the control subunit; and the second switchingsubunit is configured to shut off or close the channel between thesecond alternating current power source and the conversion unitaccording to the control signal sent by the control subunit.

With reference to the first aspect or the first possible implementationmanner of the first aspect, in a second possible implementation manner,the detection and switching unit further includes: a shutoff confirmingsubunit, where the shutoff confirming subunit is separately connected tothe control subunit, the first switching subunit, the second switchingsubunit and the conversion unit; the control subunit is furtherconfigured to first send the shutoff signal to the first switchingsubunit or the second switching subunit connected to one alternatingcurrent power source, which is in an abnormal working state, of thefirst alternating current power source and the second alternatingcurrent power source, then send a shutoff confirming indication signalthat includes a channel identifier to the shutoff confirming subunit,and after receiving a shutoff confirming signal sent by the shutoffconfirming subunit, send the closing signal to the first switchingsubunit or the second switching subunit connected to the otheralternating current power source of the first alternating current powersource and the second alternating current power source, where thechannel identifier is used to identify a channel between the firstalternating current power source and a connection unit, or the channelbetween the second alternating current power source and the conversionunit; and the shutoff confirming subunit is configured to, afterreceiving the shutoff confirming indication signal sent by the controlsubunit, determine whether a channel corresponding to the channelidentifier is shut off, and after it is determined that the channelcorresponding to the channel identifier is shut off, send a shutoffconfirming response signal to the control subunit.

According to a second aspect, an embodiment of the present inventionprovides a power supply control method, where each power sourceconversion module in a power supply apparatus is separately connected toa first alternating current power source and a second alternatingcurrent power source, and the method includes monitoring in real time aworking state of the first alternating current power source and aworking state of the second alternating current power source accordingto a working state of the first alternating current power source and aworking state of the second alternating current power source, closing achannel between a conversion unit in the power source conversion moduleand one power source, which is in a normal working state, of the firstalternating current power source and the second alternating currentpower source, and shutting off a channel between the conversion unit andthe other power source of the first alternating current power source andthe second alternating current power source; and rectifying analternating current voltage output by the one alternating current powersource, which is in the normal working state, in the channel closed by adetection and switching unit, and converting the alternating currentvoltage into a direct current voltage required by a load.

With reference to the second aspect, in a first possible implementationmanner, the method further includes, if the first alternating currentpower source is in an abnormal working state and the second alternatingcurrent power source is in an abnormal working state, send an alarmmessage to a host that manages the power supply apparatus.

With reference to the second aspect or the first possible implementationmanner of the second aspect, in a second possible implement manner, themonitoring in real time a working state of the first alternating currentpower source and a working state of the second alternating current powersource includes monitoring in real time a voltage value of the firstalternating current power source and a voltage value of the secondalternating current power source, determining, according to the voltagevalue of the first alternating current power source, whether the firstalternating current power source is in a normal working state, anddetermining, according to the voltage value of the second alternatingcurrent power source, whether the second alternating current powersource is in a normal working state.

According to a third aspect, an embodiment of the present inventionfurther provides a power supply apparatus, including N+m power sourceconversion modules described in the foregoing, where output ends of theN+m power source conversion modules are connected in parallel, so as toimplement load balancing, where N of the power source conversion modulesare main power source conversion modules, and m of the power sourceconversion modules are standby power source conversion modules, N is anatural number, and m is an integer greater than or equal to 0 and lessthan or equal to N.

In the foregoing technical solutions, a power source conversion moduleuses one alternating current power source, which is in a normal workingstate, of two alternating current power sources connected to the powersource conversion module as a power supply, and converts an alternatingcurrent voltage output by the power supply and outputs the convertedalternating current voltage to a load. Therefore, dual standby isimplemented on the alternating current power sources connected to thepower source conversion module. Because the dual standby is implementedfor alternating current power sources connected to each power sourceconversion module, for a power supply apparatus including N power sourceconversion modules, N+N standby is implemented on the power source inputby the power supply apparatus, thereby meeting a requirement ofproviding a highly reliable power supply for the load. In the prior art,to implement N+N standby of the power source, a power supply apparatusrequires N+N power source conversion modules, but the power supplyapparatus provided in this embodiment only requires N power sourceconversion modules. Therefore, under the circumstance where highreliability of the power supply is met, the number of power sourceconversion modules included in the power supply apparatus provided inthis embodiment is far less than the number of power source conversionmodules included in the power supply apparatus provided in the priorart, thereby reducing production costs of the power supply apparatus.Further, to implement standby of the power source conversion module, atleast one power source conversion module may be added in the powersupply apparatus, and therefore, the power supply apparatus thatincludes N+m power source conversion modules implements not only N+Nstandby of the power supply but also N+m standby of the power sourceconversion module.

BRIEF DESCRIPTION OF DRAWINGS

To make the technical solutions in the embodiments of the presentinvention clearer, accompanying drawings required for illustrating theembodiments are briefly introduced below. The accompanying drawings inthe following description are some embodiments of the present invention.

FIG. 1 is a schematic structural diagram of a power supply apparatusaccording to the prior art;

FIG. 2 is a schematic structural diagram of a power source conversionmodule according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of another power sourceconversion module according to an embodiment of the present invention;

FIG. 4 is a circuit structural diagram of a detection subunit accordingto an embodiment of the present invention;

FIG. 5A is a circuit structural diagram of a first switching subunitaccording to an embodiment of the present invention;

FIG. 5B is a circuit structural diagram of a second switching subunitaccording to an embodiment of the present invention;

FIG. 6A is a schematic structural diagram of still another power sourceconversion module according to an embodiment of the present invention;

FIG. 6B is a circuit structural diagram of a shutoff confirming subunitaccording to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of yet another power sourceconversion module according to an embodiment of the present invention;

FIG. 8 is a schematic circuit diagram of an auxiliary power sourcesubunit according to an embodiment of the present invention;

FIG. 9 is a schematic structural diagram of a conversion unit accordingto an embodiment of the present invention;

FIG. 10 is a schematic circuit diagram of a rectification and PFC moduleaccording to an embodiment of the present invention;

FIG. 11 is a flowchart of a power supply control method according to anembodiment of the present invention; and

FIG. 12 is a schematic structural diagram of a power supply apparatusaccording to an embodiment of the present invention.

DESCRIPTION OF EMBODIMENTS

FIG. 2 is a schematic structural diagram of a power source conversionmodule of a power supply apparatus according to an embodiment of thepresent invention. As shown in FIG. 2, a power source conversion moduleincludes a detection and switching unit 21 and a conversion unit 22. Thedetection and switching unit is connected to the conversion unit, and anoutput end of the conversion unit may be connected to a load, so as tosupply power to the load.

The detection and switching unit is further separately connected to anoutput end of a first alternating current power source and an output endof a second alternating current power source. The detection andswitching unit has two input ends, where one input end is connected tothe output end of the first alternating current power source, and theother input end is connected to the output end of the second alternatingcurrent power source. If one alternating current power source of twoalternating current power sources connected to the power sourceconversion module works normally, the power source conversion module cansupply power to the load. The first alternating current power source andthe second alternating current power source may come from differentpower supply networks of an equipment room, or may come from twodifferent Uninterruptible Power Supplies(UPSs) or batteries. Analternating current (AC) power source may be 200 V, 110 V or 120 V.

The detection and switching unit is configured to monitor in real time aworking state of the first alternating current power source and aworking state of the second alternating current power source, close achannel between the conversion unit and one alternating current powersource, which is in a normal working state, of the first alternatingcurrent power source and the second alternating current power source,and shut off a channel between the conversion unit and the otheralternating current power source of the first alternating current powersource and the second alternating current power source.

If it is monitored that the two alternating current power sources areboth in the normal working state, the detection and switching unit mayclose the channel between either of the alternating current powersources and the conversion unit, and shut off the channel between theother alternating current power source and the conversion unit, so thatthe alternating current power source in the closed channel serves as apower supply. In a case in which the two alternating current powersources are both in the normal working state, an alternating currentpower source whose channel to the conversion unit is closed by thedetection and switching unit is a power supply that supplies power tothe load, where this alternating current power source may be referred toas a main power supply, and the other is referred to as a standby powersupply. If it is monitored that one power source of the two alternatingcurrent power sources is in a non-working state, and the other is in thenormal working state, the detection and switching unit closes a channelbetween the power source in the normal working state and the conversionunit, and shut off a channel between the faulty power source and theconversion unit, so that the alternating current power source in theclosed channel serves as a power supply. Optionally, the channel betweenthe faulty power source and the conversion unit is shut off first, andthen the channel between the power source in the normal working stateand the conversion unit is closed, thereby avoiding the impact on theload caused by that the two power sources supply power to the loadsimultaneously after the faulty power source recovers back to normal.

The detection and switching unit supports dual AC inputs and one ACoutput, that is, the two power sources are both AC power source, and apower supply output by the detection and switching unit is an AC powersource.

The conversion unit is configured to rectify an alternating currentvoltage output by the one alternating current power source, which is inthe normal working state, in the channel closed by the detection andswitching unit, and convert the alternating current voltage into adirect current voltage required by the load. The conversion unit isfurther configured to filter and rectify an alternating current voltageoutput by the one alternating current power source, which is in thenormal working state, in the channel closed by the detection andswitching unit, and convert the alternating current voltage into adirect current voltage required by the load.

In a case in which the channel between the first alternating currentpower source and the conversion unit is closed, a voltage output by thefirst alternating current power source is converted into the directcurrent voltage required by the load. In a case in which the channelbetween the second alternating current power source and the conversionunit is closed, a voltage output by the second alternating current powersource is converted into the direct current voltage required by theload. The voltage required by the load and output by the conversion unitmay be −48 V or may be 12 V.

In a power source conversion module provided in this embodiment, adetection and switching unit is connected to two alternating currentpower sources; the detection and switching unit may close a channelbetween a conversion unit and one alternating current power source,which is in a normal working state, of the two power sources, and shutoff a channel between the conversion unit and the other power source ofa first alternating current power source and a second alternatingcurrent power source; the conversion unit converts a voltage output bythe one alternating current power source in the channel closed by thedetection and switching unit into a direct current voltage required by aload.

Further, after the channel between the conversion unit and one powersource of the first alternating current power source and the secondalternating current power source is closed, the detection and switchingunit determines, according to a working state of the power source in theclosed channel, whether to switch the power source connected to theconversion unit, which is as follows.

The detection and switching unit is further configured to, in a case inwhich the channel between the first alternating current power source andthe conversion unit is closed, if the first alternating current powersource is in an abnormal working state and the second alternatingcurrent power source is in a normal working state, shut off the channelbetween the first alternating current power source and the conversionunit, and close the channel between the second alternating current powersource and the conversion unit.

In a case in which the channel between the first alternating currentpower source and the conversion unit is closed, when monitoring that thefirst alternating current power source is in an abnormal working state,that is, a faulty state, and also monitoring that the second alternatingcurrent power source is in the normal working state, the detection andswitching unit shuts off the channel between the first alternatingcurrent power source and the conversion unit and closes the channelbetween the second alternating current power source and the conversionunit.

The detection and switching unit is further configured to, in a case inwhich the channel between the second alternating current power sourceand the conversion unit is closed, if the second alternating currentpower source is in an abnormal working state and the first alternatingcurrent power source is in a normal working state, shut off the channelbetween the second alternating current power source and the conversionunit, and close the channel between the first alternating current powersource and the conversion unit.

In a case in which the channel between the second alternating currentpower source and the conversion unit is closed, when monitoring that thesecond alternating current power source is in an abnormal working state,that is, a faulty state, and also monitoring that the first alternatingcurrent power source is in the normal working state, the detection andswitching unit shuts off the channel between the second alternatingcurrent power source and the conversion unit and closes the channelbetween the first alternating current power source and the conversionunit.

A power source conversion module provided in this embodiment uses onealternating current power source, which is in a normal working state, oftwo alternating current power sources connected to the power sourceconversion module as a power supply, and converts an alternating currentvoltage output by the power supply and outputs the converted alternatingcurrent voltage to a load. Therefore, dual standby is implemented on thealternating current power sources connected to the power sourceconversion module, thereby meeting a requirement of providing a highlyreliable power supply for the load.

FIG. 3 is a schematic structural diagram of another power sourceconversion module according to an embodiment of the present invention.As shown in FIG. 3, a detection and switching unit of the power sourceconversion module includes a detection subunit 31, a control subunit 32,a first switching subunit 33 and a second switching subunit 34.

The detection subunit is separately connected to an output end of afirst alternating current power source and an output end of a secondalternating current power source, and the detection subunit is furtherconnected to the control subunit. The detection subunit includes twoinput ends and one output end, where one input end is connected to theoutput end of the first alternating current power source and the otherinput end is connected to the output end of the second alternatingcurrent power source, and an output unit of the detection subunit isconnected to the control subunit. The detection subunit is configured todetect in real time a voltage value of the first alternating currentpower source and a voltage value of the second alternating current powersource, and send the detected voltage value of the first alternatingcurrent power source and the detected voltage value of the secondalternating current power source to the control subunit. For a circuitdiagram implementing the detection subunit, refer to FIG. 4.

The control subunit is separately connected to the detection subunit,the first switching subunit and the second switching subunit. The firstswitching subunit is separately connected to the first alternatingcurrent power source, the conversion unit and the control subunit, andthe second switching subunit is separately connected to the secondalternating current power source, the conversion unit and the controlsubunit. The control subunit is configured to monitor in real time,according to the voltage value of the first alternating current powersource, whether the first alternating current power source is in anormal working state, and monitor in real time, according to the voltagevalue of the second alternating current power source, whether the secondalternating current power source is in a normal working state.

The control subunit may be implemented by a demand-side platform (DSP)or multiple control unit (MCU), and may perform calculation, by using analgorithm, on the voltage values transmitted by the detection subunit,to determine whether the two power sources that are input currently arealternating current power sources or direct current power sources. Foran alternating current power source, it is determined whether thealternating current power source is in a normal working state bydetermining whether a voltage is normal and/or a frequency is normal.For a direct current power source, it is determined whether the directcurrent power source is in a normal working state by determining whethera voltage is normal. The abnormal voltage includes undervoltage,overvoltage and/or voltage loss. For the direct current power source, ifthe voltage is abnormal, it is determined that the direct current powersource is in an abnormal working state. Generally, a normal frequencyrange of the alternating current power source is 47 hertz (HZ)-63 HZ,and when the frequency falls outside the normal frequency range, it isdetermined that the alternating current power source is in an abnormalworking state. For the alternating current power source, if the voltageis abnormal or the frequency falls outside a normal range, it isdetermined that the alternating current power source is in an abnormalworking state.

The control subunit is further configured to, according to a workingstate of the first alternating current power source and a working stateof the second alternating current power source, send a closing signal tothe first switching subunit or the second switching subunit connected toone alternating current power source, which is in a normal workingstate, of the first alternating current power source and the secondalternating current power source, and send a shutoff signal to the firstswitching subunit or the second switching subunit connected to the otheralternating current power source, so as to close the channel between theconversion unit and the one alternating current power source, which isin the normal working state, of the first alternating current powersource and the second alternating current power source, and shut off thechannel between the conversion unit and the other alternating currentpower source of the first alternating current power source and thesecond alternating current power source.

For example, when it is determined that the first alternating currentpower source and the second alternating current power source are both ina normal working state, the control subunit may send a closing signal tothe first switching subunit connected to the first alternating currentpower source so as to close the channel between the first alternatingcurrent power source and the conversion unit, and send a shutoff signalto the second switching subunit connected to the second alternatingcurrent power source so as to shut off the channel between the secondalternating current power source and the conversion unit; and thecontrol subunit may also send a closing signal to the second switchingsubunit connected to the second alternating current power source so asto close the channel between the second alternating current power sourceand the conversion unit, and send a shutoff signal to the firstswitching subunit connected to the first alternating current powersource so as to shut off the channel between the first alternatingcurrent power source and the conversion unit.

For another example, when it is determined that the first alternatingcurrent power source is in a normal working state and the secondalternating current power source is in a non-working state, the controlsubunit sends a closing signal to the first switching subunit connectedto the first alternating current power source so as to close the channelbetween the first alternating current power source and the conversionunit, and sends a shutoff signal to the second switching subunitconnected to the second alternating current power source so as to shutoff the channel between the second alternating current power source andthe conversion unit.

For another example, when it is determined that the second alternatingcurrent power source is in a normal working state and the firstalternating current power source is in an abnormal working state, thecontrol subunit sends a closing signal to the second switching subunitconnected to the second alternating current power source so as to closethe channel between the second alternating current power source and theconversion unit, and sends a shutoff signal to the first switchingsubunit connected to the first alternating current power source so as toshut off the channel between the first alternating current power sourceand the conversion unit.

Further, in a case in which the channel between the conversion unit andone power source of the first alternating current power source and thesecond alternating current power source is closed, the control subunitdetermines, according to the working states of the first alternatingcurrent power source and the second alternating current power source,whether to switch the channel connected to the conversion unit, which isas follows.

The control subunit is further configured to, in a case in which thechannel between the first alternating current power source and theconversion unit is closed, if the first alternating current power sourceis in an abnormal working state and the second alternating current powersource is in the normal working state, send the shutoff signal to thefirst switching subunit, and send the closing signal to the secondswitching subunit. The control subunit is further configured to, in acase in which the channel between the second alternating current powersource and the conversion unit is closed, if the second alternatingcurrent power source is in an abnormal working state and the firstalternating current power source is in the normal working state, sendthe shutoff signal to the second switching subunit, and send the closingsignal to the first switching subunit.

In a case in which the channel between the first alternating currentpower source and the conversion unit is closed, when determining thatthe first alternating current power source is in an abnormal workingstate, that is, a faulty state, the control subunit sends the shutoffsignal to the first switching subunit. Further, it is determined whetherthe second alternating current power source is in the normal workingstate, and if the second alternating current power source is in thenormal working state, the control subunit sends the closing signal tothe second switching subunit. In a case in which the channel between thefirst alternating current power source and the conversion unit isclosed, when determining that the first alternating current power sourceis in the normal working state, the control subunit does not need tosend a control signal to the first switching subunit and the secondswitching subunit, and maintains original states of the two channels.

Likewise, in a case in which the channel between the second alternatingcurrent power source and the conversion unit is closed, when determiningthat the second alternating current power source is in the faulty state,the control subunit sends the shutoff signal to the second switchingsubunit. Further, it is determined whether the first alternating currentpower source is in the normal working state, and if the firstalternating current power source is in the normal working state, thecontrol subunit further sends the closing signal to the first switchingsubunit. In a case in which the channel between the second alternatingcurrent power source and the conversion unit is closed, when determiningthat the second alternating current power source is in the normalworking state, the control subunit does not need to send a controlsignal to the first switching subunit and the second switching subunit,and maintains original states of the two channels.

Generally, a power source of the first alternating current power sourceand the second alternating current power source may be selected as amain power source, and the other power source is a standby power source.When determining that the main power source is in an abnormal workingstate and the standby power source is in a working state, the controlsubunit sends a shutoff signal to the switching subunit connected to themain power source, and sends a closing signal to the switching subunitconnected to the standby power source. In a case in which the channelbetween the main power source and the conversion unit is closed, if itis determined that the main power source is in a normal working state,the control subunit does not need to send a control signal to the twoswitching subunits.

The first switching subunit is configured to shut off or close thechannel between the first alternating current power source and theconversion unit according to the control signal sent by the controlsubunit. If the control signal sent by the control subunit to the firstswitching subunit is a shutoff signal, the channel between the firstalternating current power source and the conversion unit is shut off, soas to isolate the first alternating current power source from theconversion unit; and if the control signal is a closing signal, thechannel between the first alternating current power source and theconversion unit is closed, so as to connect the first alternatingcurrent power source and the conversion unit.

The second switching subunit is configured to shut off or close thechannel between the second alternating current power source and theconversion unit according to the control signal sent by the controlsubunit. If the control signal sent by the control subunit to the secondswitching subunit is a shutoff signal, the channel between the secondalternating current power source and the conversion unit is shut off,and if the control signal is a closing signal, the channel between thesecond alternating current power source and the conversion unit isclosed.

A circuit structure of the first switching subunit is the same as acircuit structure of the second switching subunit, and for details,refer to circuit structural diagrams provided in FIG. 5A and FIG. 5Bseparately.

In this embodiment, a control subunit separately sends a control signalto a first switching subunit and a second switching subunit according toa voltage value of a first alternating current power source and avoltage value of a second alternating current power source that aretransmitted by a detection subunit, so that a channel between aconversion unit and one power source, which is in a normal workingstate, of the two power sources is in a closed state, thereby meeting arequirement of providing a highly reliable power supply for a loadconnected to the conversion unit.

FIG. 4 is a circuit structural diagram of a detection subunit accordingto an embodiment of the present invention. The detection subunitprovided in FIG. 4 may support AC fault detection, and may also supporthigh-voltage direct current (HVDC) fault detection. As shown in FIG. 4,a line-A power source and a line-B power source are separately connectedto the detection subunit; a voltage of the line-A power source and avoltage of the line-B power source are separately converted intopositive voltages within a suitable range by using an operationalamplifying circuit, and the positive voltages are transmitted to ananalog-to-digital converter (ADC) module for detection. In a two-leveloperational amplifying circuit shown in FIG. 4, by using a line-A inputas an example, a first-level operational amplifying circuit is U0 andresistors R1/R2/R3/R4, and a second-level operational amplifying circuitis U1 and resistors R5/R6/R7. A voltage value of the line-A input isU_(A)=A₊−A⁻, the operational amplifier U0 and the resistors R1/R2/R3/R4form a first-level amplifying circuit whose main function is to converta high voltage that needs to be detected into a low voltage that issuitable for measurement (generally, the voltage is less than 5 V).Generally, values of resistors are as follows: R1=R2, and R3=R4; afterthe first-level operational amplification, an output voltage is:U_(out1)=−U_(A)×R3/R1. The operational amplifier U1 and the resistorsR5/R6/R7 form a second-level amplifying circuit whose main function isto convert a voltage (which may be a positive voltage or a negativevoltage) output by the first-level operational amplifier into a positivevoltage that can be detected by the ADC, and the voltage range generallyis 0-3.3V. After the second-level operational amplification, an outputvoltage is: U_(out2)=(U_(out1)/R5+VDD/R6)/(1/R5+1/R6+1/R7).

The ADC module is connected to a control subunit by using a digitalinterface, for example, a Serial Peripheral Interface (SPI) or an I2Cinterface. The control subunit can acquire in real time, by using thedigital interface, a voltage value output by the ADC module. As shown inFIG. 3, the line-A power source may be a first alternating current powersource or a second alternating current power source, and accordingly,the line-B power source may be the second alternating current powersource or the first alternating current power source.

FIG. 5A is a circuit structural diagram of a first switching subunitaccording to an embodiment of the present invention. FIG. 5B is acircuit structural diagram of a second switching subunit according to anembodiment of the present invention.

A switch component inside the first switching subunit and a switchcomponent inside the second switching subunit may be a metal oxidesemiconductor field effect transistor (MOSFET), or a gallium nitridefield effect transistor (GaNFET), or a relay. In FIG. 5A and FIG. 5B,two N-channel MOSFETs or GaNFETs are used as switch components. Twoback-to-back connected MOSFETs or GaNFETs are used on each channel toimplement turn-off and turn-on functions of an AC or an HVDC. A mainfunction of each of a voltage isolation unit 0, a voltage isolation unit1, a voltage isolation unit 2 and a voltage isolation unit 3 is togenerate a voltage gate to source (VGS) voltage that can drive a sourceend (S end) of an MOSFET or a GaNFET of a channel in which each of thevoltage isolation units is located, so as to control a gate of theMOSFET or the GaNFET of the channel in which each of the voltageisolation units is located. If the switch component is a GaNFET, the VGSvoltage generally is approximately 6 V; and if the switch component is aMOSFET, the VGS voltage generally is approximately 12 V. In addition, tomake it convenient for the control subunit to turn off or turn on,according to switching requirements, the channel in which it is located,each of the voltage isolation unit 0, the voltage isolation unit 1, thevoltage isolation unit 2 and the voltage isolation unit 3 includes acontrol pin used to turn off and turn on an output voltage, and bychanging a level of the control pin, turn-off and turn-on control overthe output voltage of the voltage isolation unit in which the controlpin is located is implemented. The control pin is connected to thecontrol subunit by using an isolation optocoupler and may turn off andturn on the output of the voltage isolation unit according to a controlsignal delivered by the control subunit, thereby controlling a MOSFET ora GaNFET of a corresponding channel to be turned off or turned on.

As shown in FIG. 5A and FIG. 5B, when the control subunit needs toswitch a current main power source from a power source A to a powersource B, the control subunit first drives both a control signal 0 and acontrol signal 1 to be at a high level, and in this case, correspondingisolation optocoupler OC0 and isolation optocoupler OC1 are turned off.Further, shutdown ends of the corresponding voltage isolation unit 0 andvoltage isolation unit 1 are pulled to a positive voltage VCC_OUT, sothat the voltage isolation unit 0 and the power source isolation unit 1turn off the output, and a MOSFET or a GaNFET connected to A+ and A− ofthe first switching subunit is closed. After closing the MOSFET or theGaNFET in the first switching subunit, the control subunit drives both acontrol signal 2 and a control signal 3 to be at low levels, and in thiscase, corresponding isolation optocoupler OC2 and isolation optocouplerOC3 are turned on. Therefore, shutdown ends of the corresponding voltageisolation unit 2 and voltage isolation unit 3 are at low levelscorrespondingly, so that the voltage isolation unit 2 and the voltageisolation unit 3 output effective VGS_B+ and VGS_B− voltages, to drivethe MOSFET or the GaNFET of the first switching subunit to be turned on,thereby switching the main power source from the power source A to thepower source B.

FIG. 6A is a schematic structural diagram of still another power sourceconversion module according to an embodiment of the present invention.As shown in FIG. 6A, to avoid the impact on a load at the moment when apower source in a faulty state recovers back to normal, a detection andswitching unit may further include a shutoff confirming subunit 35, sothat a control subunit sends a closing signal to the other switchingsubunit after determining that a switching subunit receiving a shutoffsignal shuts off a corresponding channel.

The shutoff confirming subunit is separately connected to the controlsubunit, a first switching subunit, a second switching subunit and aconversion unit.

The control subunit is further configured to first send a shutoff signalto a first switching subunit or a second switching subunit connected toone alternating current power source, which is in an abnormal workingstate, of the first alternating current power source and the secondalternating current power source, then send a shutoff confirmingindication signal that includes a channel identifier to the shutoffconfirming subunit, and after receiving a shutoff confirming signal sentby the shutoff confirming subunit, send a closing signal to the firstswitching subunit or the second switching subunit connected to the otheralternating current power source of the first alternating current powersource and the second alternating current power source, where thechannel identifier is used to identify a channel between the firstalternating current power source and a connection unit, or the channelbetween the second alternating current power source and the conversionunit.

If the first alternating current power source is in a non-working stateand the second alternating current power source is in a normal workingstate, the control subunit sends the shutoff signal to the firstswitching subunit connected to the first alternating current powersource, then sends the shutoff confirming indication signal thatincludes the channel identifier to the shutoff confirming subunit, andafter receiving the shutoff confirming signal sent by the shutoffconfirming subunit, sends the closing signal to the second switchingsubunit connected to the second alternating current power source. Thecontrol subunit informs, by using the channel identifier carried in theshutoff confirming indication signal, the shutoff confirming subunit ofa power source, for which the shutoff confirming subunit needs toconfirm whether a channel between the power source and the conversionunit is shut off.

The shutoff confirming subunit is configured to, after receiving theshutoff confirming indication signal sent by the control subunit,determine whether a channel corresponding to the channel identifier isshut off, and after it is determined that the channel corresponding tothe channel identifier is shut off, send a shutoff confirming responsesignal to the control subunit.

A main function of the shutoff confirming subunit is that during powersource switching, the control subunit first confirms whether a powersource originally connected to the conversion unit is shut off, so as toavoid that a channel between another power source and the conversionunit is closed in a case in which the original power source is not shutoff. A specific circuit diagram of the shutoff confirming subunit isshown in FIG. 6B. It is confirmed whether a channel in which a powersource is located is shut off by detecting, by using a Hall currentsensor, whether a transmission current is lower than a set threshold. Toavoid incorrect determining of an alternating current sine wave at azero crossing point, generally, software continuously confirms thecurrent value for multiple times, and if the current value is lower thanthe set threshold for multiple times, it is considered that the channelin which the original power source is located is closed.

With reference to FIG. 5A and FIG. 5B, after closing a MOSFET or aGaNFET in the first switching subunit, the control subunit detectswhether a response signal output by the shutoff confirming subunit is ashutoff confirming response signal, and if the response signal is theshutoff confirming response signal, it is confirmed that the channel inwhich the current power source A is located is closed. After it isconfirmed that the channel in which the current power source A islocated is closed, the control signal 2 and the control signal 3 aredriven to be at low levels, and in this case, corresponding isolationoptocoupler OC2 and isolation optocoupler OC3 are turned on. Further,shutdown ends of the corresponding voltage isolation unit 2 and voltageisolation unit 3 are at low levels correspondingly, so that the voltageisolation unit 2 and the voltage isolation unit 3 output effectiveVGS_B+ and VGS_B− voltages, to drive the MOSFET or the GaNFET of thefirst switching subunit to be turned on, thereby switching the mainpower source from the power source A to the power source B.

FIG. 7 is a schematic structural diagram of yet another power sourceconversion module according to an embodiment of the present invention.As shown in FIG. 7, a detection and switching unit of a power sourceconversion module provided in this embodiment further includes acommunications subunit 36.

The communications subunit is separately connected to a control subunitand a host that manages a power supply apparatus; and the controlsubunit is further configured to send alarm information to thecommunications subunit when a first alternating current power source anda second alternating current power source are both in an abnormalworking state. The communications subunit is configured to transmit, tothe host that manages the power supply apparatus, the alarm informationsent by the control subunit.

The communications subunit may also send, to the control subunit,control and query information delivered by the host. The communicationssubunit may provide, according to interface requirements of differenthosts, communications interfaces that match the host, for example, aninter-integrated circuit (I2C) interface, an recommended standard—485(RS485) interface, an fast Ethernet (FE) interface, and the like.

To maintain normal working of the power source conversion module in acase of a single power source input, the detection and switching unit ofthe power source conversion module provided in this embodiment furtherincludes an auxiliary power source subunit, so as to provide a requiredworking voltage, for example, 12 V or 3.3 V, for each subunit in thedetection and switching unit. The auxiliary power source subunit isseparately connected to the first alternating current power source andthe second alternating current power source, and the auxiliary powersource subunit is further separately connected to the control subunit, afirst switching subunit, a second switching subunit, a shutoffconfirming subunit and the communications subunit, and configured tosupply power to the control subunit, the first switching subunit, thesecond switching subunit, the shutoff confirming subunit and thecommunications subunit.

FIG. 8 is a schematic circuit diagram of an auxiliary power sourcesubunit according to an embodiment of the present invention. As shown inFIG. 8, a line-A input and a line-B input each have one rectificationmodule whose main function is to implement rectification processing onan input alternating current, and convert the alternating current inputinto a direct current output. A function of a transformer module T1 anda transformer module T2 is to implement voltage conversion according tothe number of primary turns and the number of secondary turns, andimplement electric isolation between a primary voltage and a secondaryvoltage. A function of a feedback module A and a feedback module B is todetect output voltages of respective channels, and feed back thedetected voltages to Pulse Width Modulation (PWM) control modules. A PWMcontrol module A determines, according to an output voltage VCC1detected by the feedback module A, a duty cycle of a PWM signal outputto M1, and changes an output voltage value by changing the duty cycle.Likewise, a PWM control module B determines, according to an outputvoltage VCC2 detected by the feedback module B, a duty cycle of a PWMsignal output to M2, and changes an output voltage value by changing theduty cycle. M1 and M2 are separately a MOSFET. A function of a combinermodule is to implement combination processing on VCC1 and VCC2 outputvoltages, and output the combined voltages to another subunit inside thedetection and switching unit, thereby ensuring that the detection andswitching unit can maintain normal working in a case in which any powersource is faulty. Because the output power of the auxiliary power sourcesubunit is quite low, generally the combiner module may be implementedby using 2 diodes.

The auxiliary power source subunit supports a power source input from anAC power source, and also supports a power source input from an HVDCpower source. By using an input channel A as an example, when the inputpower source is from an AC power source, in the positive half period ofan AC voltage, the internal current flow of the auxiliary power sourcesubunit is as follows: A+>D0>T1>M1>AGND0>D3>A−. In the negative halfperiod of the AC voltage, the internal current flow of the auxiliarypower source subunit is as follows: A−>D1>T1>M1>AGND0>D2>A+. When theinput power source is from an HVDC power source, the internal currentflow of the auxiliary power source subunit is as follows:A+>D0>T1>M1>AGND0>D3>A−.

FIG. 9 is a schematic structural diagram of a conversion unit in a powersource conversion module according to an embodiment of the presentinvention. As shown in FIG. 9, the conversion unit includes a filtermodule, a rectification and power factor correction (PFC) module and adirect current to direct current (DC/DC) conversion module.

The filter module, the rectification and PFC module and the DC/DCconversion module are compatible with an AC input and an HVDC input, andthe filter module is configured to filter a power supply of a powersource conversion module. When the power supply of the power sourceconversion module is an AC power source, the rectification and PFCmodule implements harmonic suppression of the AC, and converts the ACinto a direct current voltage, for example, the voltage of 380 V. Whenthe power supply of the power source conversion module is an HVDC powersource, the rectification and PFC module converts an HVDC voltage into adirect current voltage, for example, 380 V, required by a DC/DC input.The rectification and PFC module may still use the current universalcircuit diagram of a rectification and PFC module; to be compatible withthe AC input and the HVDC input, the rectification and PFC module needsto use components with a high voltage withstanding property. FIG. 10 isa schematic circuit diagram of a rectification and PFC module accordingto an embodiment of the present invention. As shown in FIG. 10, when thepower supply is an HVDC power source, a current returns to a negativeend after passing, from a positive input end, through a diode D2, then aPFC circuit and finally a diode D4.

The DC/DC conversion module converts the direct current voltage outputby the PFC module into a direct current voltage, for example, 12 V or−48 V, required by a device load, and can implement current equalizationcontrol when multiple DC/DC conversion modules are connected inparallel.

FIG. 11 is a flowchart of a power control method according to anembodiment of the present invention. Each power source conversion modulein a power supply apparatus is separately connected to a firstalternating current power source and a second alternating current powersource. This embodiment is executed by a power source conversion module.As shown in FIG. 11, the power control method provided in thisembodiment includes:

Step 111: Monitor in real time a working state of the first alternatingcurrent power source and a working state of the second alternatingcurrent power source.

The power source conversion module has two input ends, where one inputend is connected to an output end of the first alternating current powersource, and the other input end is connected to an output end of thesecond alternating current power source. If one power source of the twoalternating current power sources connected to the power sourceconversion module works normally, the power source conversion module cansupply power to a load. The first alternating current power source andthe second alternating current power source may come from differentpower supply networks of an equipment room, or may come from twodifferent UPSs or batteries. The AC power source may be 220 V, 110 V or120 V.

The power source conversion module can monitor in real time a voltagevalue of the first alternating current power source and a voltage valueof the second alternating current power source, determine, according tothe voltage value of the first alternating current power source, whetherthe first alternating current power source is in a normal working state,and determine, according to the voltage value of the second alternatingcurrent power source, whether the second alternating current powersource is in a normal working state.

Step 112: According to a working state of the first alternating currentpower source and a working state of the second alternating current powersource, close a channel between a conversion unit in the power sourceconversion module and one power source, which is in a normal workingstate, of the first alternating current power source and the secondalternating current power source, and shut off a channel between theconversion unit and the other power source of the first alternatingcurrent power source and the second alternating current power source.

If it is monitored that the two alternating current power sources areboth in the normal working state, the power source conversion module mayclose the channel between either of the power sources and the conversionunit, and shut off the channel between the other alternating currentpower source and the conversion unit, so that the power source in theclosed channel serves as a power supply. The power source conversionmodule supports dual AC inputs and one AC output.

When monitoring that the first alternating current power source and thesecond alternating current power source are both in an abnormal workingstate, the power source conversion module sends an alarm message to ahost that manages the power supply apparatus.

In a case in which the channel between the first alternating currentpower source and the conversion unit is closed, if the first alternatingcurrent power source is in an abnormal working state and the secondalternating current power source is in the normal working state, thechannel between the first alternating current power source and theconversion unit is shut off first, and then the channel between thesecond alternating current power source and the conversion unit isclosed. In a case in which the channel between the second alternatingcurrent power source and the conversion unit is closed, if the secondalternating current power source is in an abnormal working state and thefirst alternating current power source is in the normal working state,the channel between the second alternating current power source and theconversion unit is shut off first, and then the channel between thefirst alternating current power source and the conversion unit isclosed.

Step 113: Rectify an alternating current voltage output by the powersource whose channel to the conversion unit is closed, and convert thealternating current voltage into a direct current voltage required by aload.

In a case in which the channel between the first alternating currentpower source and the conversion unit is closed, the alternating currentvoltage output by the first alternating current power source isrectified and converted into the direct current voltage required by theload. In a case in which the channel between the second alternatingcurrent power source and the conversion unit is closed, the alternatingcurrent voltage output by the first alternating current power source isrectified and converted into the direct current voltage required by theload. Further, the alternating current voltage output by the powersource whose channel to the conversion unit is closed is rectified andconverted into the direct current voltage required by the load.

In a power control method provided in this embodiment, each power sourceconversion module in a power supply apparatus may use one power source,which is in a normal working state, of two power sources connected tothe power source conversion module as a power supply, and convert avoltage output by the power supply and output the converted voltage to aload. Therefore, dual standby is implemented for the power sourceconnected to each power source conversion module. For a power supplyapparatus including N power source conversion modules, N+N standby isimplemented for the power supply input by the power supply apparatus,thereby meeting a requirement of providing a highly reliable powersupply for the load. In the prior art, to implement N+N standby of thepower source, a power supply apparatus requires N+N power sourceconversion modules, but the power supply apparatus provided in thisembodiment only requires N power source conversion modules. Therefore,under the circumstance where high reliability of the power supply ismet, the number of power source conversion modules included in the powersupply apparatus provided in this embodiment is far less than the numberof power source conversion modules included in the power supplyapparatus provided in the prior art, thereby reducing production costsof the power supply apparatus. Further, to implement standby of thepower source conversion module, at least one power source conversionmodule may be added in the power supply apparatus, and therefore, thepower supply apparatus that includes N+m power source conversion modulesimplements not only N+N standby of the power supply but also N+m standbyof the power source conversion module.

FIG. 12 is a schematic structural diagram of a power supply apparatusaccording to an embodiment of the present invention. As shown in FIG.12, the power supply apparatus includes N+m power source conversionmodules. Output ends of the N+m power source conversion modules areconnected in parallel, and the N+m power source conversion modulessupport load balancing, where N is a natural number and m is an integergreater than or equal to 0 and less than or equal to N. N power sourceconversion modules are main power source conversion modules and m powersource conversion modules are standby power source conversion modules,where m may be zero, indicating that the power supply apparatus providedin this embodiment may include no standby power source conversionmodule. To implement standby of the power source conversion module, 1,2, 3 . . . , N−1, or N power source conversion modules may be added inthe power supply apparatus provided in this embodiment.

The power source conversion module in FIG. 12 may be any one of thepower source conversion modules in FIG. 2, FIG. 3, FIG. 6A and FIG. 7.For a specific function and a circuit structure of the power sourceconversion module in FIG. 12, refer to descriptions of the embodimentscorresponding to FIG. 2, FIG. 3, FIG. 6A and FIG. 7, which are notdescribed again herein.

In a power supply apparatus provided in this embodiment, each powersource conversion module may use one alternating current power source,which is in a normal working state, of two alternating current powersources connected to the power source conversion module as a powersupply, and convert an alternating current voltage output by the powersupply and output the converted alternating current voltage to a load.Therefore, dual standby is implemented for the alternating current powersource connected to each power source conversion module, and for a powersupply apparatus including N power source conversion modules, N+Nstandby is implemented for the power supply input by the power supplyapparatus, thereby meeting a requirement of providing a highly reliablepower supply for the load. In the prior art, to implement N+N standby ofthe power source, a power supply apparatus needs N+N power sourceconversion modules, but the power supply apparatus provided in thisembodiment only needs N power source conversion modules. Therefore,under the circumstance where high reliability of the power supply ismet, the number of power source conversion modules included in the powersupply apparatus provided in this embodiment is far less than the numberof power source conversion modules included in the power supplyapparatus provided in the prior art, thereby reducing production costsof the power supply apparatus, and reducing the power supply apparatus.Further, to implement standby of the power source conversion module, atleast one power source conversion module may be added in the powersupply apparatus. Therefore, the power supply apparatus that includesN+m power source conversion modules implements not only N+N standby ofthe power supply but also N+m standby of the power source conversionmodule.

A person of ordinary skill in the art may understand that all or a partof the steps in the foregoing method embodiments may be implemented by aprogram instructing relevant hardware. The program may be stored in acomputer readable storage medium. When the program runs, the steps ofthe method embodiments are performed. The storage medium includes: anymedium that can store program code, such as a read-only memory(ROM), arandom access memory(RAM), a magnetic disk or an optical disc.

It should be finally noted that: the foregoing embodiments are merelyintended to describe the technical solutions of the present inventionrather than to limit the present invention. Although the presentinvention is described in detail with reference to the foregoingembodiments, persons of ordinary skill in the art should understand thatthey may still make modifications to the technical solutions describedin the foregoing embodiments or make equivalent replacements to a partor all technical features thereof, as long as such modifications orreplacements do not cause the essence of corresponding technicalsolutions to depart from the scope of the technical solutions of theembodiments of the present invention.

What is claimed is:
 1. A power source conversion module, comprising: adetection and switching unit; and a conversion unit, wherein thedetection and switching unit is separately connected to an output end ofa first alternating current power source and an output end of a secondalternating current power source, wherein the detection and switchingunit is further connected to the conversion unit, wherein the conversionunit is connected to a load, wherein the detection and switching unit isconfigured to: monitor in real time a working state of the firstalternating current power source and a working state of the secondalternating current power source; close a channel between the conversionunit and one alternating current power source, which is in a normalworking state, of the first alternating current power source and thesecond alternating current power source; and shut off a channel betweenthe conversion unit and the other alternating current power source ofthe first alternating current power source and the second alternatingcurrent power source, and wherein the conversion unit is configured to:rectify an alternating current voltage output by the one alternatingcurrent power source, which is in a normal working state, in the channelclosed by the detection and switching unit; and convert the alternatingcurrent voltage into a direct current voltage required by the load. 2.The module according to claim 1, wherein the detection and switchingunit is further configured to: shut off the channel between the firstalternating current power source and the conversion unit when thechannel between the first alternating current power source and theconversion unit is closed and when the first alternating current powersource is in an abnormal working state and the second alternatingcurrent power source is in a normal working state; and close the channelbetween the second alternating current power source and the conversionunit, and wherein the detection and switching unit is further configuredto: shut off the channel between the second alternating current powersource and the conversion unit when the channel between the secondalternating current power source and the conversion unit is closed andwhen the second alternating current power source is in an abnormalworking state and the first alternating current power source is in anormal working state; and close the channel between the firstalternating current power source and the conversion unit.
 3. The moduleaccording to claim 1, wherein the detection and switching unitcomprises: a detection subunit; a control subunit; a first switchingsubunit; and a second switching subunit, wherein the detection subunitis separately connected to the output end of the first alternatingcurrent power source and the output end of the second alternatingcurrent power source, wherein the detection subunit is further connectedto the control subunit, wherein the detection subunit is configured todetect in real time a voltage value of the first alternating currentpower source and a voltage value of the second alternating current powersource, and send the detected voltage value of the first alternatingcurrent power source and the detected voltage value of the secondalternating current power source to the control subunit, wherein thecontrol subunit is separately connected to the detection subunit, thefirst switching subunit and the second switching subunit, wherein thecontrol subunit is configured to monitor in real time, according to thevoltage value of the first alternating current power source, whether thefirst alternating current power source is in a normal working state, andmonitor in real time, according to the voltage value of the secondalternating current power source, whether the second alternating currentpower source is in a normal working state, wherein the first switchingsubunit is separately connected to the first alternating current powersource, the conversion unit and the control subunit, wherein the secondswitching subunit is separately connected to the second alternatingcurrent power source, the conversion unit and the control subunit,wherein the control subunit is further configured to: send, according toa working state of the first alternating current power source and aworking state of the second alternating current power source, a closingsignal to the first switching subunit or the second switching subunitconnected to one alternating current power source, which is in a normalworking state, of the first alternating current power source and thesecond alternating current power source; send a shutoff signal to thefirst switching subunit or the second switching subunit connected to theother alternating current power source, so as to close the channelbetween the conversion unit and the one alternating current powersource, which is in the normal working state, of the first alternatingcurrent power source and the second alternating current power source;and shut off the channel between the conversion unit and the otheralternating current power source of the first alternating current powersource and the second alternating current power source, wherein thefirst switching subunit is configured to shut off or close the channelbetween the first alternating current power source and the conversionunit according to a control signal sent by the control subunit, andwherein the second switching subunit is configured to shut off or closethe channel between the second alternating current power source and theconversion unit according to the control signal sent by the controlsubunit.
 4. The module according to claim 3, wherein the control subunitis further configured to: send the shutoff signal to the first switchingsubunit when the channel between the first alternating current powersource and the conversion unit is closed and when the first alternatingcurrent power source is in an abnormal working state and the secondalternating current power source is in a normal working state; and sendthe closing signal to the second switching subunit, and wherein thecontrol subunit is further configured to: send the shutoff signal to thesecond switching subunit when the channel between the second alternatingcurrent power source and the conversion unit is closed and when thesecond alternating current power source is in an abnormal working stateand the first alternating current power source is in a normal workingstate; and send the closing signal to the first switching subunit. 5.The module according to claim 3, wherein the detection and switchingunit further comprises a shutoff confirming subunit, wherein the shutoffconfirming subunit is separately connected to the control subunit, thefirst switching subunit, the second switching subunit and the conversionunit, wherein the control subunit is further configured to: first sendthe shutoff signal to the first switching subunit or the secondswitching subunit connected to one alternating current power source,which is in an abnormal working state, of the first alternating currentpower source and the second alternating current power source, then senda shutoff confirming indication signal that comprises a channelidentifier to the shutoff confirming subunit, and send the closingsignal to the first switching subunit or the second switching subunitconnected to the other alternating current power source of the firstalternating current power source and the second alternating currentpower source after receiving a shutoff confirming signal sent by theshutoff confirming subunit, wherein the channel identifier is used toidentify the channel between the first alternating current power sourceand the conversion unit, or the channel between the second alternatingcurrent power source and the conversion unit, and wherein the shutoffconfirming subunit is configured to: determine whether a channelcorresponding to the channel identifier is shut off after receiving theshutoff confirming indication signal sent by the control subunit; andsend a shutoff confirming response signal to the control subunit afterit is determined that the channel corresponding to the channelidentifier is shut off.
 6. The module according to claim 5, wherein thedetection and switching unit further comprises a communications subunit,wherein the communications subunit is separately connected to thecontrol subunit and a host that manages a power supply apparatus,wherein the control subunit is further configured to send alarminformation to the communications subunit when the first alternatingcurrent power source is in an abnormal working state or the secondalternating current power source is in an abnormal working state, andwherein the communications subunit is configured to transmit, to thehost that manages the power supply apparatus, the alarm information sentby the control subunit.
 7. The module according to claim 6, wherein thedetection and switching unit further comprises an auxiliary power sourcesubunit, wherein the auxiliary power source subunit is separatelyconnected to the first alternating current power source and the secondalternating current power source, and wherein the auxiliary power sourcesubunit is further separately connected to the control subunit, thefirst switching subunit, the second switching subunit, the shutoffconfirming subunit and the communications subunit, and configured tosupply power to the control subunit, the first switching subunit, thesecond switching subunit, the shutoff confirming subunit and thecommunications subunit.
 8. The module according to claim 4 wherein thedetection and switching unit further comprises a shutoff confirmingsubunit, wherein the shutoff confirming subunit is separately connectedto the control subunit, the first switching subunit, the secondswitching subunit and the conversion unit, wherein the control subunitis further configured to: first send the shutoff signal to the firstswitching subunit or the second switching subunit connected to onealternating current power source, which is in an abnormal working state,of the first alternating current power source and the second alternatingcurrent power source; then send a shutoff confirming indication signalthat comprises a channel identifier to the shutoff confirming subunit;and send the closing signal to the first switching subunit or the secondswitching subunit connected to the other alternating current powersource of the first alternating current power source and the secondalternating current power source after receiving a shutoff confirmingsignal sent by the shutoff confirming subunit, wherein the channelidentifier is used to identify the channel between the first alternatingcurrent power source and the conversion unit, or the channel between thesecond alternating current power source and the conversion unit, andwherein the shutoff confirming subunit is configured to: determinewhether a channel corresponding to the channel identifier is shut offafter receiving the shutoff confirming indication signal sent by thecontrol subunit, and send a shutoff confirming response signal to thecontrol subunit after it is determined that the channel corresponding tothe channel identifier is shut off.
 9. The module according to claim 8,wherein the detection and switching unit further comprises acommunications subunit, wherein the communications subunit is separatelyconnected to the control subunit and a host that manages a power supplyapparatus, wherein the control subunit is further configured to sendalarm information to the communications subunit when the firstalternating current power source is in an abnormal working state or thesecond alternating current power source is in an abnormal working state,and wherein the communications subunit is configured to transmit, to thehost that manages the power supply apparatus, the alarm information sentby the control subunit.
 10. The module according to claim 9, wherein thedetection and switching unit further comprises an auxiliary power sourcesubunit, wherein the auxiliary power source subunit is separatelyconnected to the first alternating current power source and the secondalternating current power source, and wherein the auxiliary power sourcesubunit is further separately connected to the control subunit, thefirst switching subunit, the second switching subunit, the shutoffconfirming subunit and the communications subunit, and configured tosupply power to the control subunit, the first switching subunit, thesecond switching subunit, the shutoff confirming subunit and thecommunications subunit.
 11. A power supply method, wherein each powersource conversion module in a power supply apparatus is separatelyconnected to a first alternating current power source and a secondalternating current power source, and the method comprises: monitoringin real time a working state of the first alternating current powersource and a working state of the second alternating current powersource; closing, according to a working state of the first alternatingcurrent power source and a working state of the second alternatingcurrent power source, a channel between a conversion unit in the powersource conversion module and one power source, which is in a normalworking state, of the first alternating current power source and thesecond alternating current power source; shutting off a channel betweenthe conversion unit and the other power source of the first alternatingcurrent power source and the second alternating current power source;rectifying an alternating current voltage output by the one alternatingcurrent power source, which is in the normal working state, in thechannel closed by a detection and switching unit; and converting thealternating current voltage into a direct current voltage required by aload.
 12. The method according to claim 11, wherein the method furthercomprises: shutting off the channel between the second alternatingcurrent power source and the conversion unit when the channel betweenthe second alternating current power source and the conversion unit isclosed and when the second alternating current power source is in anabnormal working state and the first alternating current power source isin a normal working state; and closing the channel between the firstalternating current power source and the conversion unit.
 13. The methodaccording to claim 11, wherein the method further comprises: shuttingoff the channel between the first alternating current power source andthe conversion unit when the channel between the first alternatingcurrent power source and the conversion unit is closed and when thefirst alternating current power source is in an abnormal working stateand the second alternating current power source is in a normal workingstate; and closing the channel between the second alternating currentpower source and the conversion unit.
 14. The method according to claim13, wherein the method further comprises sending an alarm message to ahost that manages the power supply apparatus when the first alternatingcurrent power source and the second alternating current power source areboth in an abnormal working state.
 15. The method according to claim 14,wherein the monitoring in real time a working state of the firstalternating current power source and a working state of the secondalternating current power source comprises: monitoring in real time avoltage value of the first alternating current power source and avoltage value of the second alternating current power source;determining, according to the voltage value of the first alternatingcurrent power source, whether the first alternating current power sourceis in a normal working state; and determining, according to the voltagevalue of the second alternating current power source, whether the secondalternating current power source is in a normal working state.
 16. Themethod according to claim 11, wherein the method further comprisessending an alarm message to a host that manages the power supplyapparatus when the first alternating current power source and the secondalternating current power source are both in an abnormal working state.17. The method according to claim 16, wherein the monitoring in realtime a working state of the first alternating current power source and aworking state of the second alternating current power source comprises:monitoring in real time a voltage value of the first alternating currentpower source and a voltage value of the second alternating current powersource; determining, according to the voltage value of the firstalternating current power source, whether the first alternating currentpower source is in a normal working state; and determining, according tothe voltage value of the second alternating current power source,whether the second alternating current power source is in a normalworking state.
 18. A power supply apparatus comprising: N+m power sourceconversion modules, wherein output ends of the N+m power sourceconversion modules are connected in parallel so as to implement loadbalancing, wherein N of the power source conversion modules are mainpower source conversion modules, wherein m of the power sourceconversion modules are standby power source conversion modules, whereinN is a natural number, wherein m is an integer greater than or equal to0 and less than or equal to N, wherein the power source conversionmodule comprises a detection and switching unit and a conversion unit,wherein the detection and switching unit is separately connected to anoutput end of a first alternating current power source and an output endof a second alternating current power source, wherein the detection andswitching unit is further connected to the conversion unit, wherein theconversion unit is connected to a load, wherein the detection andswitching unit is configured to: monitor in real time a working state ofthe first alternating current power source and a working state of thesecond alternating current power source; close a channel between theconversion unit and one alternating current power source, which is in anormal working state, of the first alternating current power source andthe second alternating current power source; and shut off a channelbetween the conversion unit and the other alternating current powersource of the first alternating current power source and the secondalternating current power source, and wherein the conversion unit isconfigured to: rectify an alternating current voltage output by the onealternating current power source, which is in a normal working state, inthe channel closed by the detection and switching unit; and convert thealternating current voltage into a direct current voltage required bythe load.
 19. The power supply apparatus according to claim 18, whereinthe detection and switching unit is further configured to: shut off thechannel between the first alternating current power source and theconversion unit when the channel between the first alternating currentpower source and the conversion unit is closed and when the firstalternating current power source is in an abnormal working state and thesecond alternating current power source is in a normal working state;and close the channel between the second alternating current powersource and the conversion unit, and wherein the detection and switchingunit is further configured to: shut off the channel between the secondalternating current power source and the conversion unit when thechannel between the second alternating current power source and theconversion unit is closed and when the second alternating current powersource is in an abnormal working state and the first alternating currentpower source is in a normal working state; and close the channel betweenthe first alternating current power source and the conversion unit. 20.The power supply apparatus according to claim 18, wherein the detectionand switching unit comprises: a detection subunit; a control subunit; afirst switching subunit; and a second switching subunit, wherein thedetection subunit is separately connected to the output end of the firstalternating current power source and the output end of the secondalternating current power source, wherein the detection subunit isfurther connected to the control subunit, wherein the detection subunitis configured to detect in real time a voltage value of the firstalternating current power source and a voltage value of the secondalternating current power source, and send the detected voltage value ofthe first alternating current power source and the detected voltagevalue of the second alternating current power source to the controlsubunit, wherein the control subunit is separately connected to thedetection subunit, the first switching subunit and the second switchingsubunit, wherein the control subunit is configured to monitor in realtime, according to the voltage value of the first alternating currentpower source, whether the first alternating current power source is in anormal working state, and monitor in real time, according to the voltagevalue of the second alternating current power source, whether the secondalternating current power source is in a normal working state, whereinthe first switching subunit is separately connected to the firstalternating current power source, the conversion unit and the controlsubunit, wherein the second switching subunit is separately connected tothe second alternating current power source, the conversion unit and thecontrol subunit, wherein the control subunit is further configured to:send, according to a working state of the first alternating currentpower source and a working state of the second alternating current powersource, a closing signal to the first switching subunit or the secondswitching subunit connected to one alternating current power source,which is in a normal working state, of the first alternating currentpower source and the second alternating current power source; send ashutoff signal to the first switching subunit or the second switchingsubunit connected to the other alternating current power source, so asto close the channel between the conversion unit and the one alternatingcurrent power source, which is in the normal working state, of the firstalternating current power source and the second alternating currentpower source; and shut off the channel between the conversion unit andthe other alternating current power source of the first alternatingcurrent power source and the second alternating current power source,wherein the first switching subunit is configured to shut off or closethe channel between the first alternating current power source and theconversion unit according to a control signal sent by the controlsubunit, and wherein the second switching subunit is configured to shutoff or close the channel between the second alternating current powersource and the conversion unit according to the control signal sent bythe control subunit.
 21. The power supply apparatus according to claim20, wherein the control subunit is further configured to: send theshutoff signal to the first switching subunit when the channel betweenthe first alternating current power source and the conversion unit isclosed and when the first alternating current power source is in anabnormal working state and the second alternating current power sourceis in a normal working state; and send the closing signal to the secondswitching subunit; and wherein the control subunit is further configuredto: send the shutoff signal to the second switching subunit when thechannel between the second alternating current power source and theconversion unit is closed and when the second alternating current powersource is in an abnormal working state and the first alternating currentpower source is in a normal working state; and send the closing signalto the first switching subunit.
 22. The power supply apparatus accordingto claim 20, wherein the detection and switching unit further comprisesa shutoff confirming subunit, wherein the shutoff confirming subunit isseparately connected to the control subunit, the first switchingsubunit, the second switching subunit and the conversion unit, whereinthe control subunit is further configured to: first send the shutoffsignal to the first switching subunit or the second switching subunitconnected to one alternating current power source, which is in anabnormal working state, of the first alternating current power sourceand the second alternating current power source; then send a shutoffconfirming indication signal that comprises a channel identifier to theshutoff confirming subunit; and send the closing signal to the firstswitching subunit or the second switching subunit connected to the otheralternating current power source of the first alternating current powersource and the second alternating current power source after receiving ashutoff confirming signal sent by the shutoff confirming subunit,wherein the channel identifier is used to identify the channel betweenthe first alternating current power source and the conversion unit, orthe channel between the second alternating current power source and theconversion unit, and wherein the shutoff confirming subunit isconfigured to: determine whether a channel corresponding to the channelidentifier is shut off after receiving the shutoff confirming indicationsignal sent by the control subunit, and send a shutoff confirmingresponse signal to the control subunit after it is determined that thechannel corresponding to the channel identifier is shut off.
 23. Thepower supply apparatus according to claim 22, wherein the detection andswitching unit further comprises a communications subunit, wherein thecommunications subunit is separately connected to the control subunitand a host that manages a power supply apparatus, wherein the controlsubunit is further configured to send alarm information to thecommunications subunit when the first alternating current power sourceis in an abnormal working state or the second alternating current powersource is in an abnormal working state, and wherein the communicationssubunit is configured to transmit, to the host that manages the powersupply apparatus, the alarm information sent by the control subunit. 24.The power supply apparatus according to claim 23, wherein the detectionand switching unit further comprises an auxiliary power source subunit,wherein the auxiliary power source subunit is separately connected tothe first alternating current power source and the second alternatingcurrent power source, and wherein the auxiliary power source subunit isfurther separately connected to the control subunit, the first switchingsubunit, the second switching subunit, the shutoff confirming subunitand the communications subunit, and configured to supply power to thecontrol subunit, the first switching subunit, the second switchingsubunit, the shutoff confirming subunit and the communications subunit.25. The power supply apparatus according to claim 21, wherein thedetection and switching unit further comprises a shutoff confirmingsubunit, wherein the shutoff confirming subunit is separately connectedto the control subunit, the first switching subunit, the secondswitching subunit and the conversion unit, wherein the control subunitis further configured to: first send the shutoff signal to the firstswitching subunit or the second switching subunit connected to onealternating current power source, which is in an abnormal working state,of the first alternating current power source and the second alternatingcurrent power source; then send a shutoff confirming indication signalthat comprises a channel identifier to the shutoff confirming subunit;and send the closing signal to the first switching subunit or the secondswitching subunit connected to the other alternating current powersource of the first alternating current power source and the secondalternating current power source after receiving a shutoff confirmingsignal sent by the shutoff confirming subunit, wherein the channelidentifier is used to identify the channel between the first alternatingcurrent power source and the conversion unit, or the channel between thesecond alternating current power source and the conversion unit, andwherein the shutoff confirming subunit is configured to: determinewhether a channel corresponding to the channel identifier is shut offafter receiving the shutoff confirming indication signal sent by thecontrol subunit; and send a shutoff confirming response signal to thecontrol subunit after it is determined that the channel corresponding tothe channel identifier is shut off.
 26. The power supply apparatusaccording to claim 25, wherein the detection and switching unit furthercomprises a communications subunit, wherein the communications subunitis separately connected to the control subunit and a host that manages apower supply apparatus, wherein the control subunit is furtherconfigured to send alarm information to the communications subunit whenthe first alternating current power source is in an abnormal workingstate or the second alternating current power source is in an abnormalworking state, and wherein the communications subunit is configured totransmit, to the host that manages the power supply apparatus, the alarminformation sent by the control subunit.
 27. The power supply apparatusaccording to claim 26, wherein the detection and switching unit furthercomprises an auxiliary power source subunit, wherein the auxiliary powersource subunit is separately connected to the first alternating currentpower source and the second alternating current power source, andwherein the auxiliary power source subunit is further separatelyconnected to the control subunit, the first switching subunit, thesecond switching subunit, the shutoff confirming subunit and thecommunications subunit, and configured to supply power to the controlsubunit, the first switching subunit, the second switching subunit, theshutoff confirming subunit and the communications subunit.